Pore Pressure Under A Gravity Based Structure Under The Influence Of Waves

Erik Damgaard Christensen, Stefan Carstensen, Mikael Thyge Madsen, Peter Allerød Hesselbjerg, Christel Jeanty Nielsen

    Research output: Chapter in Book/Report/Conference proceedingArticle in proceedingsResearchpeer-review

    Abstract

    The total wave load on a gravity based foundation for offshore wind turbines is influenced by the pore pressure from beneath the structure. The pore pressure is induced by the wave–structure-seabed interaction. Often the uplift force is included in a simplified way in the design of the gravity based foundation. This leads typically to very conservative designs in order to accommodate the uncertainties in the procedure. The experiments shall lead to better prediction models based on for instance CFD model’s with the direct calculation of pressure variations in the seabed and any erosion protection layer. Herewith, it will be possible to get a direct assessment of wave loads on the foundation, also under the seabed level. The study includes experiments as well as numerical analyses. A good agreement between the experimental results and the numerical analyses was found. In the numerical analyses, it was possible to investigate the effect of air content in the pores, which turned out to have an effect on the distribution of the pore pressure.
    Original languageEnglish
    Title of host publicationProceedings of the 36st International Conference on Ocean, Offshore, and Arctic Engineering (OMAE36)
    Number of pages10
    Volume10
    PublisherThe American Society of Mechanical Engineers (ASME)
    Publication date2017
    Article numberOMAE2017-62585
    ISBN (Electronic)978-0-7918-5778-6
    DOIs
    Publication statusPublished - 2017
    Event36st International Conference on Ocean, Offshore, and Arctic Engineering (OMAE36) - Trondheim, Norway
    Duration: 25 Jun 201730 Jun 2017

    Conference

    Conference36st International Conference on Ocean, Offshore, and Arctic Engineering (OMAE36)
    Country/TerritoryNorway
    CityTrondheim
    Period25/06/201730/06/2017

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